Apparatus for making metal chains.



T. E. MURRAY. APPARATUS FOR MAKING METAL CHAINS.

Mama May 21, 1918. 7

INVEN TOR mf M @TTOW EY. I

rnouns a. uUnnaY,

OF NEW YORK, K. Y.

APPARATUS FOR MAKING METAL CHAINS.

Specification of Letters Patent.

Patented May 21, 1918.

Application filed December 29, 1917. Serial No. 209,880.

To all whom it may concern:

Be it known that I, THOMAS E. MURRAY,-

' a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented a certain new and useful Im rovement in Apparatus for Making Metal hains, of which the following is a specification.

The invention is an apparatus for making metal chains. Each link is first made in two half sections. A completed link is then threaded upon one of said half sections, and

then the butt ends of said half sections areelectrically welded together. The apparatus comprises electrodes constructed to hold the link sections in suitable grooves in their opplosing faces, one of said electrodes having a c annel 0 en at both ends for receiving a completed nk threaded upon one of said half sections.

In the accompanying drawin s-- Figure l is an elevation o two chain links, one of said links being in place in the welding electrodes. Fi 2 shows in perspective one member 0 the pair of lower electrodes. Fig. 3 shows in perspective one member of the pair of upper electrodes. Fig. 415 a section on the line as, m and Fig. dis a section on the line 3 y of Fig. 1.

Similar letters and numbers of reference indicate like parts.

The electrodes are shown at A and B. The lower electrode A is formed of two half sections, one of which is shown in Fig. 2. In the face of each section is a U-shaped.

groove 1, which is bisected by the central channel 2 which extends vertically through the section and is open at both ends. On the opposite sides of the section are lugs 3 for the reception of the clamping bolts 4, by which the said sections are connected together. I

The upper electrode B is also formed of two half sections, one of which is shown in Fig. 3. In the face of each section is an inverted U-shaped groove 5, and on opposite sides of said section are lugs 6 for the reception of the clamping bolts 7 The chain links are made in half sections C, D which are to be butt-welded together. To this end the lower link section C is placed in the corresponding grooves 1 of the sections of the lower electrode A, and the upper link section D is placed in the half link sections wit corresponding grooves 5 of the sections of the upper electrode B, the butt ends of the sections C, D then registering. If a preceding linkE to that to be made has already been com leted, said link is pla'ced in the correspon in channels 2 of electrode A, and is threa ed upon the lower half section C of the link to be welded, as shown-in Fig. 1, so that said link is suspended upon said lower halfisection. The bolts 4. and 7 being set up to clamp the link sections in the electrodes, said electrodes are rela-,

tively moved to bring the butt ends of the link sections into contact, and the welding current is established. -As the metal at the joints becomes plastic, the link sections are pressed together, thus uniting said sections and completing the link.

' I claim:

1. An electrical welding apparatus for chain links, comprising two relatively movable electrodes for sup orting two U-shaped their butt ends in welding contact, each electrode comprising a pair of similar half sections receiving a half link between them, and one of said electrodes having an opening to receive a half link threaded upon one of said half sections, and clamping means for securing together the half sections of each electrode.

2. An electrical welding apparatus for chain links, comprising two block electrodes, each having a U-shaped recess for receiving a U-shaped half link section and relatively movable one to the. other, and means for clamping said sections in said electrodes, one of said electrodes being constructed to permit the threading of a half link section upon a previously formed link.

3. An electrical welding apparatus for chain links, comprising two superposed block electrodes, each having a recess for receiving a U-shaped half link section, and one of said electrodes having at right angles to the U-shaped recess therein a recess for re ceiving a half link section threaded upon a previously formed link, and means for moving said electrodes relatively to one another.

4. An electrical welding apparatus for chain links, comprising two relatively movable electrodes, each electrode comprising a pair of similar half sections, each section having in its face a U-shaped groove, the

said grooves in one electrode being inverted grooves therein, and clam ing mean s'for se- 10 ,with respect to the grooves in the other eleccuring together the hal sections of each trode, and the ends of the grooves in one electrode, r l electrode regi'stermg with the ends of the In testimonywhereof- I have aflixed my grooves in the other electrode, the members signature in presence of two witnesses.

of the pair of half sections of one electrode THOMAS E. MURRAY. having in their faces registering channels Witnesses: open at their ends, extending across the faces GERTRUDE T. PORTER,

of said members and bisecting the U-shaped MAY T. MCGARRY. 

